Black mold in bathrooms is not just unsightly. It is also deadly. S. chlorohalonata, or toxic black mold, actually affects the quality of indoor air and can be the root cause of many respiratory ailments. Constant exposure to this type of mold can lead to lung and nose bleeding, headaches, and nose and throat irritation. If you’re also experiencing unexplained hair loss, eye irritation, rashes, and sudden allergies without any visible cause, chances are your home has toxic black mold.